Simple Multi-stage DC-AC Converter Circuit Architecture

Abstract

The invention reveals a simple multi-order direct current / alternating current converting circuit configuration, which comprises a double input direct current power supply, a power control group, and an alternating current low pass filter. Each input of the double input direct current power supply provides half of the rated direct current voltage to the power control group. The power control group comprises six power switches, and is capable of converting a direct current voltage into an alternating current voltage output by controlling turn-on and turn-off combination of the power switches. Two power switches of the power control group execute low frequency switching only twice in an output voltage period and withstand voltages of the two power switches are the same with the input voltage, and other power switches execute switching in high frequency and the withstand voltages of the power switches are half of the input voltage, to synthesize an output mode with multi-order voltage level, and alternate current waveform with low harmonic wave is obtained after going through the low pass filter at the alternating current side. The simple multi-order direct current / alternating current converting configuration is applicable to a wide range, with which usage efficiency is enhanced while cost is reduced.

Description

technical field [0001] The present invention relates to a DC-to-AC conversion circuit, in particular to a simple multilevel DC-to-AC conversion circuit architecture with six power switches. Background technique [0002] Such as Figure 15 As shown, the commonly used DC-AC conversion circuit has eight power switches Sa1, Sa2, Sa3, Sa4, Sb1, Sb2, Sb3, and Sb4, and by controlling the different conduction or cut-off combinations of each power switch, the The effect of converting DC voltage to AC voltage output. [0003] The above-mentioned commonly used DC-AC conversion circuit adopts eight power switches Sa1, Sa2, Sa3, Sa4, Sb1, Sb2, Sb3, and Sb4, so not only the number of components is large, but also because each power switch must have a capacity equal to the input The withstand voltage value of the voltage size will cause the cost of its components to be effectively reduced; moreover, during the DC-to-AC conversion process of the commonly used DC-to-AC conversion circuit, a...

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Problems solved by technology

[0003] The above-mentioned commonly used DC-to-AC conversion circuit adopts eight power switches Sa1, Sa2, Sa3, Sa4, Sb1, Sb2, Sb3, and Sb4, so not only the number of components is large, but also because each power switch must have a capacity equal to the input The withstand voltage value of the voltage size will cause the cost of its components to be effectively reduced; moreover, during the DC-to-AC conversion process of the commonly used DC-to-AC conversion circuit, all power switches switch at high frequency, so it will cause its The switching loss is high, and the power switch is easily damaged

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